Epsilon Sigma Alpha International (ΕΣΑ) is a collegiate and service organization for women and men ages 18 and older. The organization states that its purpose "is to inspire leadership and service by bringing good people together to pursue programs and projects that make a positive difference locally, nationally and internationally."

The European Space Agency (ESA) is an intergovernmental organisation dedicated to the exploration of space, with 22 member states. Established in 1975 and headquartered in Paris, France, ESA has a staff of more than 2,000 with an annual budget of about €4.28 billion / US$5.51 billion (2013).